STS-110
Extravehicular Activities

The STS-110
crew will perform four spacewalks during its stay at the International
Space Station to install and outfit the S0 (S-Zero) Truss. All four
spacewalks will be based out the U.S. Joint Airlock Quest.

STS-110 Mission
Specialist Ellen Ochoa and Expedition Four Flight Engineer Dan Bursch
used the International Space Station's robotic arm to lift the S0
Truss out of Space Shuttle Atlantis' payload bay and install it
onto the temporary claw fixture on the U.S. Destiny Laboratory.
Once the truss was attached, spacewalkers Steve Smith and Rex Walheim
began setting up tools outside. The bulk of their time was spent
making initial power and data connections between the station and
the S0. They also bolted the two forward struts that will permanently
hold the truss in place.

The primary
focus for spacewalkers Jerry Ross and Lee Morin was the continuation
of power and data cable connections between S0 and the International
Space Station. They also bolted two aft struts that will permanently
hold the S0 in place.

During STS-110's
third spacewalk, Smith and Walheim released the claw that was used
in the initial attachment of the S0 Truss. Then, they installed
connectors that will be used to route power to Canadarm2 when it
is on the truss. They also spent time working with the Mobile Transporter,
releasing its many launch restraints and removing a small thermal
cover from its radiator. The transporter is the structure to which
the arm's Mobile Base System will be attached. The transporter will
be commanded to move for the first time on Flight Day 8.

The final major
task was the pivoting of a beam, which is called the Airlock Spur,
between the Quest Airlock and the S0. The spur will be used by spacewalkers
in the future as a path from the airlock to the truss.
They installed handrails onto the S0, partially assembled a platform,
installed two floodlights and performed several other get-ahead
tasks.

EVA
Team

STS-110
Mission Specialist Lee Morin during the mission's second spacewalk.